| 摘要 |
FIELD: volume charge generation for shaping electron beam in electron guns of microwave devices. ^ SUBSTANCE: proposed process includes following procedures. Spiral anode is disposed coaxially to emitter-layer covered cylindrical cathode. Anode is provided with cooling air passage. Anode is connected to high-frequency power supply. Anode functions here as inductor and builds electromagnetic field around cathode. The latter reverses polarity of magnetization many times a second, and short-circuit eddy currents start flowing therein. These currents concentrate in surface layer of cathode due to surface effect and heat cathode through definite depth. Emitter layer of cathode starts passing electrons and generates volume charge. ^ EFFECT: enhanced speed due to reduced warm-up period of cathode; enhanced reliability. ^ 1 cl, 1 dwg |
